Admin Login • Instructor Login • Student Login

Your Support

Departmental Colloquium

Exploring Spin Glasses and other Complex Energy Landscapes with Extremal Dynamics  
Guest Speaker
Stefan Boettcher  
Guest Affiliation
Emory University  
Michael Bachmann  
Thursday, September 12, 2013 4:00 pm - 12:00 am  
Physics Auditorium Rm. 202  

I describe Extremal Optimization (EO), a general-purpose, local search heuristic for hard combinatorial (and physical) problems  such as bi-partitioning (ie, model-B ferromagnets), coloring (ie, Potts antiferromagnets), and max-cut (ie, Ising Spin Glasses). EO is motivated by the Bak-Sneppen model of self-organized criticality (SOC). SOC provides a general dynamics of driven dissipative systems that operate far from equilibrium and exhibit many emergent properties,  such as scale-free fluctuations, memory and learning, and persistent returns to untypical (here: ground-state) configurations. The generic properties of EO are explored, which explain the efficiency of EO in searching many 'complex energy-landscapes'. Numerical results of EO are discussed especially for the Edwards-Anderson spin-glass problem.